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  1. #11
    Ole
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    There are also a lot of "intermediate length" lenses that are constructed like "normal" lenses. Most 35mm users equate "telephoto" with "longer than 50mm", but many lenses up to about 200mm are really normal lenses. All they need to be MF (or sometimes LF) lenses is a hacksaw to remove the rear half. Sometimes not even that - the Leitz 135mm Hektor simply unscrews. What you're left with is an extension tube, and a 135mm Tessar-type lens in helical focusing mount.
    -- Ole Tjugen, Luddite Elitist
    Norway

  2. #12
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    Use the right tool for the job. Why try to reinvent the wheel? Besides if you start cutting lenses in half that realy messes with the electronics for the iris or do want to cut a hole in the side and make waterhouse stops? And I still want to know about the shutter.
    DIGITAL IS FOR THOSE AFRAID OF THE DARK.

  3. #13
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    Wouldn't it need to be 46.5mm from the film plane to focus on infinity? And at that distance I imagine the image circle would be pretty small.

    -A

  4. #14

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    Quote Originally Posted by Anupam Basu
    Wouldn't it need to be 46.5mm from the film plane to focus on infinity? And at that distance I imagine the image circle would be pretty small.

    -A
    Anupam, the "cut the rear section off of a long focus lens" trick works, when it does, because the lens is just an achromatic doublet hung way out in front of the film plane. We're used to more complex constructions, but some well-respected third-party lens makers made such simple long lenses. Century Precision Optics, for one, also Kilfitt and Novoflex.

    46.5 mm is the Nikon F flange-to-film distance. Most other SLR mounts' -- yes, Nikon isn't the only one -- flange-to-film distances are shorter.

    Cheers,

    Dan

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